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	Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at
	 
		http://www.mozilla.org/MPL/MPL-1.1.html
	 
	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
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import com.bourre.data.iterator.ArrayIterator;
import com.bourre.data.iterator.Iterator;

/**
 * Iterates over a Memento list.
 *
 * @author Romain Ecarnot
 */
class fever.data.iterator.MementoIterator extends ArrayIterator implements Iterator
{	
	//------------------------------------------------------------------//
	// Public API
	//------------------------------------------------------------------//
	
	/**
	 * Constructor.
	 * 
	 * @param a Memento {@code Array} 
	 */
	public function MementoIterator( a : Array )
	{
		super(a);
		
		_n = a.length -1;
	}
	
	/**
	 * Indicates if we can check for a previous element in array.
	 * 
	 * @return {@code Boolean}
	 */
	public function hasPrevious() : Boolean
	{
		return (_n > 0);
	}
	
	/**
	 * Returns previous element in array.
	 */
	public function previous()
	{
		return _a[--_n];
	}
	
}